摘要
选区激光熔化中逐行逐层扫描粉末成形的熔道以及熔结表面在很大程度上影响制件质量。从选区激光熔化的工艺原理出发,得到单行扫描优化的线能量密度范围,进一步结合平均重熔率对多行扫描熔道搭接的介观表面形貌进行分析,结果表明,线能量密度在0.070~0.217 J/mm时,熔道相对连续、线宽相对均匀;多行扫描的平均重熔率过小会造成较大表面高度差,过大会产生裂纹,平均重熔率为18%~50%时能得到较为平整的熔结表面。
Melting tracks and fusion surfaces formed by the “line by line-layer by layer” scanning in selective laser melting can greatly affect the quality of the product.Based on the process principle of selective laser melting,the optimized range of line energy density was obtained by single line scanning.The mesoscopic surface morphology of overlapped melting tracks formed by multi-line scanning was further analyzed by combining the average re-melting rate.Results show that the melting tracks are relatively continuous and the line width is relatively uniform when the linear energy density is between 0.070 and 0.217 J/mm.Small average re-melting rate of multi-line scanning will result in large surface height difference,and if the average re-melting rate is too large,the surface cracks will occur.When the average re-melting rate is between 18% and 50%,a relatively smooth surface can be obtained.
作者
荣远卓
杨寅晨
李晓峰
王翔
Rong Yuanzhuo;Yang Yinchen;Li Xiaofeng;Wang Xiang(Department of Precision Mechanic and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui 230027,China)
出处
《应用激光》
CSCD
北大核心
2022年第1期15-20,共6页
Applied Laser
基金
安徽省重点研究与开发计划(1704a0902051)。
关键词
选区激光熔化
线能量密度
熔结表面
平均重熔率
selective laser melting
linear energy density
fusion surface
average re-melting rate
